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Home
Failure To Replicate The Aubert-fleischl Effect.

Home
Failure To Replicate The Aubert-fleischl Effect.

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Failure to replicate the Aubert-Fleischl effect.

Björn Jörges¹, Laurence R Harris¹

¹Center for Vision Research, York University, Keele Street, Toronto, Canada.

|December 26, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Humans do not underestimate object speed when tracking with their eyes, contrary to the Aubert-Fleischl phenomenon. Visual scene context, not just motion, influences speed perception.

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Area of Science:

Vision Science
Perceptual Psychology

Background:

The Aubert-Fleischl phenomenon suggests humans underestimate object speed during gaze pursuit compared to fixation.
Previous studies often used blank backgrounds, potentially limiting real-world applicability.

Purpose of the Study:

To investigate if background motion cues influence the Aubert-Fleischl effect.
To test the hypothesis that the visual system compensates for underestimation of speed with contextual information.

Main Methods:

A two-interval forced-choice task was used with 50 participants in a virtual reality environment.
Participants compared the speed of a moving sphere (or sphere-cloud) either while pursuing it or maintaining fixation.
Stimuli were presented against a black background (no cues) or a textured background (with cues).

Main Results:

No evidence for the Aubert-Fleischl effect (underestimation of speed during pursuit) was found in either environment.
Object speed perception did not differ significantly between pursuit and fixation conditions, regardless of background presence.

Conclusions:

The traditional Aubert-Fleischl effect may not hold true when visual scene context is present.
Object speed perception is influenced by environmental cues, challenging the established understanding of pursuit-induced underestimation.